Beauty doesn't always need to be expensive. Well, not the most expensive, anyway.

They may not cost $1 million, but the "Signature Diamond" speakers from U.K.-based Bowers & Wilkins doesn't skimp on materials: These limited editions are sculpted in marble and have tweeters that use diamond crystals "to deliver a cleaner, purer sound," according to BornRich.

And compared with the "Grand Enigma" they're price is a drop in the ocean at $22,000. Each, of course.